[Wayland] Transparency issue with media player on Linux

Steps to reproduce:

1. Build and run example https://doc.qt.io/qt-6/qtmultimedia-player-example.html
2. Drag the windows and move it on the screen.

Expected: Black screen is shown when there is no video loaded.

Actual: Weird transparency issue when moving the window. It happens only on Wayland. Tried the same on Xorg - no issue. 

Reproducibility:  100%